Use the *67 code
*67 is a "vertical service code" — one of several codes you can dial to unlock special features on your phone. Specifically, adding *67 to the start of any phone number will block your caller ID when you call that number. This is a quick and temporary way to block your number when making calls.
How do I hide my number when calling?
How do I block Caller ID for a specific call?
- Enter *67.
- Enter the number you wish to call (including area code).
- Tap Call. The words "Private," "Anonymous," or some other indicator will appear on the recipient's phone instead of your mobile number.
Does * 67 still work on iPhone?
And for what it's worth, *67 works to dial out anonymous calls on any iPhone, landline, Android, Blackberry, or Windows phone, it is the universal 'anonymous' prefix code.